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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1af0dc54c7780d20669d9c35b51c72628b970d9f64ad55665a4957aa6952db' 
  AND token = 'hr0URUBDqWtmhn0/uTqaDEfjT9Q+rooSSyAImkyDK78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}